Unbalanced disks

[Toscano]

Hi everyone
I recently moved a PD from Cage:3 to Cage:1 on a 3par 7200.  I moved the PD for balancing disks on pair.

Now when I run a health check on the PD it throws the following message:

checkhealth -detail pd
Checking pd
Component ----Summary Description----- Qty
PD Unbalanced PD types in Cages 1
------------------------------------------
1 total 1
Component -Identifier- ------------------------Detailed Description-------------------------
PD Cage:1 PDs FC/10K/600GB unbalanced. Primary path: 10 on Node:0, 12 on Node:1
--------------------------------------------------------------------------------------------
1 total

By checking the Cage:1 I get the following output, I can see a balance problem on disks ID: 93 and ID: 94

showpd -p -cg 1
----Size(MB)---- ----Ports----
Id CagePos Type RPM State Total Free A B Capacity(GB)
16 1:0:0 FC 10 normal 559104 324608 1:0:1* 0:0:1 600
17 1:1:0 FC 10 normal 559104 295936 1:0:1 0:0:1* 600
18 1:2:0 FC 10 normal 559104 326656 1:0:1* 0:0:1 600
19 1:3:0 FC 10 normal 559104 292864 1:0:1 0:0:1* 600
20 1:4:0 FC 10 normal 559104 327680 1:0:1* 0:0:1 600
21 1:5:0 FC 10 normal 559104 295936 1:0:1 0:0:1* 600
22 1:6:0 FC 10 normal 559104 326656 1:0:1* 0:0:1 600
23 1:7:0 FC 10 normal 559104 294912 1:0:1 0:0:1* 600
24 1:8:0 FC 10 normal 559104 325632 1:0:1* 0:0:1 600
25 1:9:0 FC 10 normal 559104 292864 1:0:1 0:0:1* 600
26 1:10:0 FC 10 normal 559104 323584 1:0:1* 0:0:1 600
27 1:11:0 FC 10 normal 559104 287744 1:0:1 0:0:1* 600
28 1:12:0 FC 10 normal 559104 323584 1:0:1* 0:0:1 600
29 1:13:0 FC 10 normal 559104 300032 1:0:1 0:0:1* 600
30 1:14:0 SSD 150 normal 456704 146432 1:0:1* 0:0:1* 480
31 1:15:0 SSD 150 normal 456704 146432 1:0:1* 0:0:1* 480
68 1:16:0 FC 10 normal 559104 311296 1:0:1* 0:0:1 600
69 1:17:0 FC 10 normal 559104 299008 1:0:1 0:0:1* 600
74 1:18:0 FC 10 normal 559104 314368 1:0:1* 0:0:1 600
75 1:19:0 FC 10 normal 559104 295936 1:0:1 0:0:1* 600
81 1:20:0 FC 10 normal 559104 318464 1:0:1* 0:0:1 600
87 1:21:0 FC 10 normal 559104 300032 1:0:1 0:0:1* 600
93 1:23:0 FC 10 normal 559104 316416 1:0:1* 0:0:1 600
94 1:22:0 FC 10 normal 559104 316416 1:0:1* 0:0:1 600
----------------------------------------------------------------------
24 total 13213696 7103488

Does anyone know how to correct the balance problem of the PD´s ID: 93 and ID: 94 disks ?
Thank in avance

[sbhat09]

Hi Toscano,

In 3PAR, along with number of PDs in each cage, disk balancing depends on several parameters like type of CPGs, levels of availability (mag, cage, port) and set size.

To advise on how to rebalance PDs, more information required like detailed steps about how you moved the PD?, CPGs in use, availability level, set size, disk utilization level, number of cages, number of each type of PDs etc.

In this scenario, it requires log analysis and planning to do rebalancing. So, I advise you to open a support case with HPE and involve an expert.

Regards,

Srini